EP0781640A2 - Buse obturatrice à aiguille chauffée - Google Patents

Buse obturatrice à aiguille chauffée Download PDF

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Publication number
EP0781640A2
EP0781640A2 EP96119518A EP96119518A EP0781640A2 EP 0781640 A2 EP0781640 A2 EP 0781640A2 EP 96119518 A EP96119518 A EP 96119518A EP 96119518 A EP96119518 A EP 96119518A EP 0781640 A2 EP0781640 A2 EP 0781640A2
Authority
EP
European Patent Office
Prior art keywords
section
sleeve
needle valve
valve according
heated needle
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP96119518A
Other languages
German (de)
English (en)
Other versions
EP0781640A3 (fr
EP0781640B1 (fr
Inventor
Peter Dr. Braun
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Ewikon Heisskanalsysteme GmbH and Co KG
Original Assignee
Ewikon Heisskanalsysteme GmbH and Co KG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Ewikon Heisskanalsysteme GmbH and Co KG filed Critical Ewikon Heisskanalsysteme GmbH and Co KG
Publication of EP0781640A2 publication Critical patent/EP0781640A2/fr
Publication of EP0781640A3 publication Critical patent/EP0781640A3/fr
Application granted granted Critical
Publication of EP0781640B1 publication Critical patent/EP0781640B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C45/20—Injection nozzles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C45/26—Moulds
    • B29C45/27—Sprue channels ; Runner channels or runner nozzles
    • B29C45/28—Closure devices therefor
    • B29C45/2806—Closure devices therefor consisting of needle valve systems

Definitions

  • the invention relates to a heated valve gate nozzle for plastic injection molding machines, for injection molding tools or hot runner devices.
  • Needle valve nozzles are known in which mechanical, pneumatic or hydraulic drive means are provided for displacing the valve needle in the axial opening or closing direction.
  • Such nozzles which have a melt inlet side connected to the injection molding machine and a melt outlet side connected to the mold cavity, there is a difficulty in supplying the closing needle with the force necessary for the axial closing and opening movement. Both on the melt inlet side and on the melt outlet side there is no possibility of connecting the needle to corresponding drives. For this reason, the forces in the middle region are supplied in the case of needle valve nozzles according to the prior art. However, this requires a corresponding diversion of the flow channel around the central region, as is shown and described in US Pat. No. 5,387,099 and in EP 0 373 293.
  • valve gate nozzles can only be produced with greater expenditure on the device and can be heated uniformly with higher energy consumption.
  • the invention has for its object to design a heated valve gate of the type mentioned so that a one-sided load on the needle is prevented by the flowing melt and the dimensions of the valve gate are kept small.
  • FIGS. 1a, 1b and in FIG. 2 An essential basic idea is shown in a highly simplified manner in FIGS. 1a, 1b and in FIG. 2.
  • a hot runner section 10 is shown, which is formed from the sections 12 and 14, one end 16 of which can be connected to a machine nozzle 18 or a hot runner distributor (not shown) and the other end 20 of which is the actual nozzle to which the mold cavity or the mold cavity of the injection mold connects.
  • the two sections 12, 14 shown schematically in FIG. 1 a are shown without heating elements and an integrated nozzle needle for better understanding and for a better overview.
  • a gap S1 is formed between the outer diameter 15 of the section 12 and the inner diameter 19 of the section 14.
  • the sleeve 22 designed with the appropriate wall thickness is arranged in this gap S1 and is thus axially displaceably mounted between the sections 12, 14.
  • the sleeve 22 is provided at one end with a device 21 which is suitable for interacting with a power drive, not shown, which can move the sleeve axially and which will be discussed below.
  • the sleeve 22 is connected to a locking needle 24.
  • FIG. 2 shows the sleeve 22 and the locking needle 24 in the open position. A movement of the sleeve in the direction of arrow 26 brings the locking needle 24 into the closed position.
  • section 12 projects by dimension L2 into section 14.
  • the section 12 consists of a substantially cylindrical tubular body 80, in which a flow channel 86 is formed for the material melt.
  • the sleeve 22 On the outer diameter 15 of the tubular body 80, the sleeve 22, as shown in FIG. 2, is guided in a sealingly movable manner.
  • the sleeve 22 is also guided with its outer diameter in the second section 14 in a sealingly movable manner.
  • the sleeve is connected to a power drive and with its end 88, which faces into the flow channel, to the closure needle 24.
  • the flow channel 86 of the hot runner section 10 runs essentially over its entire length symmetrically to the common axis 84 of the partial sections 12, 14, the closure needle 24 and the sleeve 22.
  • FIG. 2 further shows an electrical heating element 28 arranged centrally in the partial section 12 and a heating element 30 surrounding the partial section 14.
  • the sleeve 22 can be connected at the end facing away from the locking needle 24 to a hydraulic, pneumatic or mechanical drive, by means of which the sleeve 22 can be moved axially in order to bring about the closing and opening movement of the locking needle 24 connected to the sleeve.
  • FIG. 3 shows a modification to the construction according to FIG. 2, which likewise uses the gap S1 that results between the partial sections 12, 14.
  • the gap is filled by a guide bush 32, which has at least one bore 34 through which a bolt 36 is guided, which connects the device 38 to the sleeve 40 in a geared manner.
  • the sleeve 40 is provided on its end face facing away from the closure needle 24 with a contour which corresponds to the front end of the section 12 and / or the heating element 28.
  • the heating element 28 extends into the area of influence of the heating element 30.
  • FIG. 4 shows the hot runner section 10 in detailed form.
  • Such a hot runner section must generate heat as far as possible to a predetermined extent and dissipate it to the melt. Local overheating must not occur, and heat loss or solidification of the melt must not occur.
  • the thermal expansions do not exceed a precalculated level in order to avoid sealing problems. Furthermore, overheating must not occur in the area of the device 21, in particular not if it is designed as a hydraulic / pneumatic piston with sealing elements, as in the exemplary embodiment according to FIGS. 4 and 5.
  • the sections 12, 14 of the hot runner section 10 are fixed in a housing 42 and in tool plates 44, 46.
  • a cylinder 48 is formed in the housing 42, which cooperates with the device 21 designed as a piston 50 and the sleeve 22.
  • the piston 50 is equipped with seals 52.
  • the piston 50 can be moved into the closed or open position of the closure needle by means of pressure media. Due to the internal heating element 28 in the area of the section 12, little heat escapes to the outside. This means that the surrounding or adjacent components, e.g. the piston and the cylinder, especially their seals, are relatively cool. This has a particularly favorable effect on their service life.
  • the section 14 is surrounded by a sleeve 54, a heating element 30 being mounted between the section and the sleeve 54. This heating element could e.g. from a heating coil or the like. consist.
  • the heating element 28 is designed according to the known prior art, for example according to DE-OS 33 35 280.
  • a centrally arranged, electrically conductive heating element is surrounded in an electrically insulated manner by a tubular body, the heating rod and tubular body being electrically connected at their free end and forming a circuit.
  • This arrangement of heating element and tube is generally called heating conductor.
  • the heating conductor In the area of its front free end, the heating conductor is of enlarged diameter.
  • the front end face 56 of the heating conductor which is designed as a partial dome, when the locking needle is withdrawn (opened), allows the melt to flow through openings on the one hand 58 can dodge and on the other hand creates an increase in surface area to transfer enough heat into the adjacent end face 56.
  • the cone-like enlargement 62 between the partial cap and the cylindrical part of the heating conductor 28 conducts the melt through the openings 58 into the second partial section 14 in a flow-favorable manner.
  • FIG. 6 shows detail A in FIG. 4 in an enlarged representation.
  • a seal 74 can be arranged in a corresponding recess 68 in the region of the upper end 72 of the section 14. Such seals, however, belong to the known prior art, so that this will not be discussed further.
  • no special seals are provided between the movable sleeve 22 and the fixed sections 12, 14.
  • the fact that the melt solidifies in more or less thick layers adjacent to the cooler walls that delimit the flow channel is used here.
  • These solidified layers in the area of the components which are movable relative to one another form a natural seal which can make separate seals unnecessary.
  • the front annular end face of the first section 12 has a cutting edge 90 in the area of the outer diameter. This peels off the areas of the plastic material that are still hot but already solidified from the wall of the sleeve 22 and guides the material back into the core area of the melt. With each cycle, a new solidified and sealing area is built up, which is, however, always returned.
  • the situation is similar in the region of the gap formed between the partial section 14 and the sleeve 22.
  • the same principle of action is used.
  • the melt will also penetrate into this gap and solidify.
  • the locking needle is urging in the closed position, the melt is pushed back through the openings 58.
  • the solidified layer which is used for sealing, remains in the area of the cooler areas of the section 14.
  • FIG. 7 shows an exemplary embodiment in which no gap is formed between the sections 12, 14.
  • the sleeve 22 is reduced in diameter at its end 78 facing the locking needle 24. This makes it possible to reduce the diameter of the second section 14, which means that in the case of multiple shapes, i.e. if several hot runner sections 10 are fed from one distributor, the nest distances can be kept small.
  • no gap S1 is formed, but the diameters of the sleeve 22 which are adapted to the sections 12, 14 enable sealing to the sections 12, 14.
  • the construction according to FIG. 7 is designed in its functional parts as the embodiments described above.

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
  • Details Of Valves (AREA)
  • Superconductors And Manufacturing Methods Therefor (AREA)
  • Coating By Spraying Or Casting (AREA)
  • Nozzles (AREA)
  • Perforating, Stamping-Out Or Severing By Means Other Than Cutting (AREA)
EP96119518A 1995-12-23 1996-12-05 Buse obturatrice à aiguille chauffée Expired - Lifetime EP0781640B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19548687 1995-12-23
DE19548687A DE19548687B4 (de) 1995-12-23 1995-12-23 Beheizte Nadelverschlußdüse

Publications (3)

Publication Number Publication Date
EP0781640A2 true EP0781640A2 (fr) 1997-07-02
EP0781640A3 EP0781640A3 (fr) 1997-07-09
EP0781640B1 EP0781640B1 (fr) 2003-02-19

Family

ID=7781382

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96119518A Expired - Lifetime EP0781640B1 (fr) 1995-12-23 1996-12-05 Buse obturatrice à aiguille chauffée

Country Status (11)

Country Link
US (1) US5830524A (fr)
EP (1) EP0781640B1 (fr)
JP (1) JP4248034B2 (fr)
KR (1) KR100435944B1 (fr)
AT (1) ATE232783T1 (fr)
BR (1) BR9606130A (fr)
CA (1) CA2193565A1 (fr)
DE (2) DE19548687B4 (fr)
DK (1) DK0781640T3 (fr)
ES (1) ES2187605T3 (fr)
SG (1) SG96165A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108927963A (zh) * 2018-07-07 2018-12-04 苏州华吉威自动化设备有限公司 一种具有自剪断浇口功能的模具
CN108943614A (zh) * 2018-07-07 2018-12-07 苏州华吉威自动化设备有限公司 一种水冷型塑胶加工模具

Families Citing this family (23)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19746556A1 (de) * 1997-10-22 1999-05-06 Hotset Heizpatronen Zubehoer Rohrförmiges elektrisches Heizelement zur Beheizung eines Düsenkörpers
DE29809855U1 (de) * 1998-06-03 1998-08-20 Günther Heißkanaltechnik GmbH, 35066 Frankenberg Nadelverschlußdüse
US6655945B1 (en) 1999-03-18 2003-12-02 Mold Masters Limited Apparatus and method for multi-layer injection molding
US6440350B1 (en) 1999-03-18 2002-08-27 Mold-Masters Limited Apparatus and method for multi-layer injection molding
US6398537B2 (en) 1999-04-02 2002-06-04 Mold-Masters Limited Shuttle system for an apparatus for injection molding
US6196826B1 (en) 1999-05-28 2001-03-06 Mold-Masters Limited Seepage system for an injection molding apparatus
US6413076B1 (en) 1999-12-03 2002-07-02 Robert F. Dray, Sr. Shut-off nozzle
US6419116B1 (en) * 2001-02-27 2002-07-16 D-M-E Company Molding nozzle gate valve
US7014455B2 (en) 2002-03-14 2006-03-21 Mold-Masters Limited Valve-gated injection molding system with side-mounted actuator
US7175418B2 (en) * 2002-11-04 2007-02-13 University Of Massachusetts Melt control system for injection molding
CA2449907C (fr) * 2002-11-21 2012-01-03 Mold-Masters Limited Buse a obturateur en ligne
EP1961548B1 (fr) * 2003-04-07 2010-02-24 Mold-Masters (2007) Limited Buse à canaux chauffants avec scellement de fusion
DE10359639B4 (de) * 2003-12-18 2014-01-30 Carl Freudenberg Kg Stützlager
US7226283B2 (en) * 2004-10-13 2007-06-05 Mold-Masters Limited Injection molding apparatus with a melt channel in valve pin
GB2420524A (en) * 2004-11-27 2006-05-31 Symons Sibson & Co Ltd Apparatus for providing meltable material in a molten state to a mould
US7341094B2 (en) * 2005-05-02 2008-03-11 Husky Injection Molding Systems Ltd. Metallic alloy slurry dispenser
DE102006004265A1 (de) * 2006-01-31 2007-08-09 Incoe International, Inc. Hochbelastbare Dichtungen für Spritzgießanlagen
US7513772B2 (en) * 2007-05-09 2009-04-07 Mold-Masters (2007) Limited Injection molding nozzle with valve pin alignment
KR101291332B1 (ko) 2011-10-11 2013-07-30 (주)성진기계 사출 성형기
KR101441181B1 (ko) * 2012-05-31 2014-09-18 주상규 수지 공급노즐용 니들
US20200070393A1 (en) * 2018-09-04 2020-03-05 Chung Hsien Lin Movable Needle Valve of Hot-Runner Mold
CN110303641A (zh) * 2019-08-05 2019-10-08 东莞市捷晨硅橡胶机械有限公司 硅胶射嘴
CN114147919B (zh) * 2021-10-19 2023-08-01 宁波力松注塑科技有限公司 一种注塑机喷嘴及注塑机

Citations (5)

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Publication number Priority date Publication date Assignee Title
DE2824971A1 (de) 1978-06-07 1979-12-13 Ewikon Entwicklung Konstr Duese fuer eine kunststoffspritzgussmaschine, ein extrudermundstueck oder ein heisskanalwerkzeug
DE3335280A1 (de) 1983-09-29 1985-04-18 EWIKON Entwicklung und Konstruktion GmbH & Co KG, 4900 Herford Elektrisch betriebenes heizelement zum aufheizen von materialschmelzen in einem heisskanalwerkzeug
DE3640620A1 (de) 1985-12-18 1987-06-19 Strack Gmbh Norma Duese fuer spritzgiessformen
EP0373293A2 (fr) 1988-12-16 1990-06-20 Jobst Ulrich Gellert Mécanisme de commande à crémaillère pour l'aiguille d'obturateur de moulage par injection
US5387099A (en) 1994-02-14 1995-02-07 Gellert; Jobst U. Injection molding valve member sealing bushing with a thin collar portion

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DE2539785C3 (de) * 1975-09-06 1981-01-29 Dangelmaier Bernhard U. Co, 7410 Reutlingen Heißkanalspritzdüse
US4333608A (en) * 1980-09-19 1982-06-08 Ex-Cell-O Corporation Injection molding nozzle
JPS59142124A (ja) * 1983-02-02 1984-08-15 Shigeru Tsutsumi 合成樹脂射出成形機用ホツトチツプブシング
JPS60116U (ja) * 1983-06-17 1985-01-05 ティーディーケイ株式会社 ホツトランナのノズル構造
JPH0452024Y2 (fr) * 1987-06-30 1992-12-08
US4781572A (en) * 1987-10-09 1988-11-01 Sonoco Products Company Self-regulating gate valve assembly for injection molding apparatus
CA1261575A (fr) * 1988-04-13 1989-09-26 Jobst U. Gellert Entree a obturateur pour moulage par injection a buses d'injection en tandem
NL8802810A (nl) * 1988-11-15 1990-06-01 Eurotool Bv Inspuitmondstuk voor toepassing bij een spuitgiet-inrichting.
DE4005437A1 (de) * 1990-02-21 1991-08-29 Dangelmaier Sfr Formbau Beheizte duese, sogenannte langduese fuer ein kunststoff-spritzgiesswerkzeug
DE4222510C1 (de) * 1992-07-09 1993-12-09 Edmund Ullisperger Nadelverschlußdüse für Kunststoff-Spritzmassen
DE4404894C1 (de) * 1994-02-16 1995-01-05 Dangelmaier Sfr Formbau Beheizte Düse zur Zuführung einer Kunststoffschmelze in die Formhöhlung eines Kunststoff-Spritzgießwerkzeuges

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2824971A1 (de) 1978-06-07 1979-12-13 Ewikon Entwicklung Konstr Duese fuer eine kunststoffspritzgussmaschine, ein extrudermundstueck oder ein heisskanalwerkzeug
DE3335280A1 (de) 1983-09-29 1985-04-18 EWIKON Entwicklung und Konstruktion GmbH & Co KG, 4900 Herford Elektrisch betriebenes heizelement zum aufheizen von materialschmelzen in einem heisskanalwerkzeug
DE3640620A1 (de) 1985-12-18 1987-06-19 Strack Gmbh Norma Duese fuer spritzgiessformen
EP0373293A2 (fr) 1988-12-16 1990-06-20 Jobst Ulrich Gellert Mécanisme de commande à crémaillère pour l'aiguille d'obturateur de moulage par injection
US5387099A (en) 1994-02-14 1995-02-07 Gellert; Jobst U. Injection molding valve member sealing bushing with a thin collar portion

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108927963A (zh) * 2018-07-07 2018-12-04 苏州华吉威自动化设备有限公司 一种具有自剪断浇口功能的模具
CN108943614A (zh) * 2018-07-07 2018-12-07 苏州华吉威自动化设备有限公司 一种水冷型塑胶加工模具

Also Published As

Publication number Publication date
ES2187605T3 (es) 2003-06-16
EP0781640A3 (fr) 1997-07-09
DE19548687A1 (de) 1997-06-26
JPH09225966A (ja) 1997-09-02
BR9606130A (pt) 1998-11-03
DK0781640T3 (da) 2003-06-02
KR970033714A (ko) 1997-07-22
DE59610153D1 (de) 2003-03-27
KR100435944B1 (ko) 2004-09-21
SG96165A1 (en) 2003-05-23
JP4248034B2 (ja) 2009-04-02
US5830524A (en) 1998-11-03
ATE232783T1 (de) 2003-03-15
DE19548687B4 (de) 2004-01-08
CA2193565A1 (fr) 1997-06-24
EP0781640B1 (fr) 2003-02-19

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